Ribbon cassette



FIG. 1 is a top perspective view of a ribbon cassette showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is an end elevation view thereof; and

FIG. 7 is a perspective view showing the bottom thereof.

This application is related to copending applications, all assigned to the assignee of the present application and entitled "Ribbon Cartridge" bearing Ser. No. 848,136, filed on Nov. 3, 1977, in the name of John A. Garrido; Ser. No. 852,297 filed on Nov. 17, 1977, in the name of Joseph C. Sereika; and Ser. No. 852,298, filed on Nov. 17, 1977 in the name of Joseph A. Marsico. 

The ornamental design for a ribbon cassette, as shown. 